Organizational. Architectures of Cognition Lecture 1. What cognitive phenomena will we examine? Goals of this course. Practical Assignments.
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1 Architectures of Cognition Lecture 1 Niels Taatgen Artificial Intelligence Webpage: 2 Organizational Practical assignments start Next Week Work in pairs 3 assignments Grade = (1/4)*assignments + (3/4)*exam Two afternoons but you don t have to attend both Two readers (but not printed yet) Slides will be on the website 3 Goals of this course 4 What cognitive phenomena will we examine? What is cognitive modeling about, and what are architectures of cognition Compare different proposals for architectures (ACT-R, EPIC, Soar, Neural Networks) Examine how a particular architecture, ACT-R, can offer theories for diverse areas of cognition Individual differences in Working Capacity Learning the Past Tense in English Learning the Balanced Scale task Learning Air Traffic Control Practical Assignments 6 Contents 1. Multi-column addition 2. Subitizing 3. Alphabet Arithmetic History of cognitive modeling Some philosophy of science Example of a cognitive model: learning without consciousness Applications of cognitive modeling 1
2 7 History: The Turing thesis/test Turing test/thesis Computers can do anything Human Intelligence is something Computers can do human intelligence Turing s work was very comforting for the first wave of AI research Newell & Simon: Logic Theorist and General Problem Solver Minsky: Microworlds Early successes were followed by great future claims 9 AI Today 10 Modeling AI is concerned with programs that do intelligent things without any claims of mimicking human intelligence. Example: Deep Blue No longer aspires (at least not openly) to build a conscious intelligent machine Attempts to better understand human intelligence by using computer simulation However: the legacy of Turing, computers can do anything, has become a hindrance 11 You can t play Twenty Questions with Nature and win 12 Some phenomena Paper (1973) by Alan Newell. The title of the paper refers to a game Newell argues psychologists study phenomena and try to explain them by all kinds of binary oppositions Subitizing (Klahr) Continuous rotation effect (Shepard) Serial position effect in free recall Chunks in STM (Miller) Linear search in sets in STM (Sternberg) These are just of the list of 9 2
3 13 Some binary oppositions Nature vs. Nurture Serial vs. Parallel processing Continuous vs. all-or-none learning Conscious vs. Unconscious Innate vs. learned grammars (Chomsky) etc. 14 An endless game... According to Newell, this type of research will never reach the goal of understanding cognition So he proposes a number of solutions 1 Newell s solutions Study large, real-life tasks, and find out all aspects of that task (example: chess) Complete processing models: formal, computational models of human thinking Newell: The best theory of a phenomenon is a computer program that produces it 16 Problems Problem with computational models: they can do anything in principle Solution: Look for constraints 17 Look at it from the Kuipers perspective 1 A more realistic theory Really Real great Theory Unrestricted computer simulation All Possibly Conceivable Predicted Real All Possibly Conceivable 3
4 19 Conclusion 20 Sources of constraint A cognitive theory based on simulation needs constraints, boundaries on the power of universal computation. Neural architecture Constraints on what can be achieved in a certain time-step Constraints on the basic units of knowledge The constraint of learning 21 Modeling Paradigms 22 Symbolic Connectionist Dynamical systems Artificial life Hybrid Early work by Newell and Simon: General Problem Solver Purely symbolic Focus on problem solving Corresponds to present-day AI search techniques Contemporary successor: Soar Engineering models: Model Human Processor (Card, Moran & Newell, 193) No theory on knowledge representation or knowledge processing Predictions about timing Contemporary successor: EPIC Neural networks No real cognitive architecture or unified theory of cognition Constraints derived from limitations imposed on cells in the network 4
5 2 ACT-R Hybrid architecture Has symbolic aspects derived from AI (production system architecture) Has adapted EPIC s perceptual/motor theory Has adapted (some) learning and activation principles from neural networks 26 The idea of constraints is at odds with current memory research Try to identify different memory systems by separating different memory functions Problem: each additional memory systems loosens the constraints on the systems, and opens up more explanations for a particular phenomenon instead of less 27 Squire & Knowlton (199) Episodic Explicit Semantic Procedural And what about Newell s Binary Oppositions? Implicit Priming Classical Conditioning 2 Sugar Factory Task (Berry & Broadbent, model by Wallach) Participants have to achieve a certain goal output of a sugar factory by setting the number of workers for each day The output is calculated on the basis of the number of workers and the output on the previous day, but the formula is unknown to participants Demo 29 Sugar Factory details Keep the production P of a simulated sugar factory at a target value T, by allocating an appropriate number of workers W to the job. System dynamics are controlled by: P t = 2 W t - P t-1 + Random Factor (-1/0/1) Production depends on previous day Random Factor makes it hard to find underlying rule 30 Production 2 Sugar Factory task Goal Production = 9 Production 1 Production 2 Workers New Production 9 Production 9 Workers New Production 1 Production 9
6 31 Wallach s model 32 Results Yesterday 2 Workers 7 Production Yesterday 7 Goal Production Declarative 33 Discussion Reasoning is based on patterns There is no (real) strategy, there are no attempts of inference, and there is no deliberate storage of experiences Yet the model performs the task as well as participants Participants do attempt to find rules, but are unsuccessful, so it doesn t impact their performance 34 Implicit vs. Explicit memory? The Sugar Factory task can be explained by a very simple model that remembers old examples No specific distinctions are needed Other example: word recognition vs. word completion 3 Conclusion In order to explain the Tulving experiment, it is not necessary to postulate two separate memory systems Similar models have been made of other implicit learning experiments, e.g. SugarFactory (Broadbent & Berry), and sequence learning 36 Cognitieve Architectuur (ACT-R) Cognitief phenomeen X Theorie van X d.m.v. Model van X Vergelijking Experiment: Data Voorspellingen 6
7 37 3 Cognitieve ergonomie Model van Gebruiker test Interface Cognitieve ergonomie Student/user models Interface of leerprogramma Gebruiker of Leerling Student model 39 Cognitieve ergonomie Student/user models Simulatie van arbeidsituaties Model (agent) Proef persoon Proef persoon Model (agent) Model (agent) Simulatie van een taak in een omgeving 7
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